- Stabilized dozens of APIs (e.g., BinaryHeap, Condvar, Path, VecDeque, iterator traits) and added cargo install support for installing binaries to ~/.cargo/bin as subcommands.
- Breaking changes include revised dropck rules, AsRef/AsMut implementations for Box, Rc, and Arc that can clash with existing methods, removal of the long‑deprecated #[derive(Show)] and stricter placement rules for #[inline] and #[repr], ...
- Extensive bug fixes and soundness/performance improvements: method‑invocation checks, object‑safety enforcement, faster Vec drops, reduced core library size, and numerous optimizations in code generation and trait resolution.
Rust 1.5.0
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Language: allow shortening lifetimes of &mut during unsize coercions and introduce new lints for invalid runtime symbols and c void return types.